Camera more particularly for use in aerial photography



H. D. WOOTTON CAMERA MORE PARTICULARLY FOR USE IN AERIAL PHOTOGRAPHY Filed Dec. 29. 1922 Sheets-Sheet 1 Oct'. 2 1923.

H. D. WOOTTON CAMERA MORE PARTICULARLY FOR USE IN AERIAL PHOTOGRAPHY Filed Dec. 29. 1922 8 Sheets-Sheet 2 Oct. 2 1923.

H. D. WOOTTON CAMERA MORE PARTICULARLY FOR USE IN AERIAL PHOTOGRAPHY Filed Dec. 29. 1922 8 Sheets-Sheet 5 Oct. 2 1923. 1,469,569

H. D. WOOTTON CAMERA MORE PARTICULARLY FOR USE IN AERIAL PHOTOGRAPHY 8 Sheets-Sheet Filed Dec. 29. 1922 Oct. 2 1923. 1,469,569

H. D. WOOTTON CAMERA MORE PARTICULARLY FOR USE IN AERIAL PHOTOGRAPHY Filed D80. 29 1922 8 Sheets-Sheet 5 1:4 o 5 o 9 6| 0 0 6| 0 ea. 8 o a I'll-Ir 1 I ll '1 Oct. 2 H. D. WOOTTON CAMERA MOR E PARTICULARLY FOR USE IN AERIAL PHOTOGRAPHY Oct. 2 1923. 1,469,569

H. D. WOOTTON CAMERA MORE PARTICULARLY FOR USE IN AERIAL PHOTOGRAPHY Filed Dec. 29. 1922 8 Sheets-Sheet Oct. 2 1923. 1,469,569

H. D. WOOTTON CAMERA MORE PARTICULARLY FOR USE IN AERIAL PHOTOGRAPHY Filed Dec. 29, 1922 8 Sheets-Sheet 8 Patented Oct. 2, 1923.

HERBERT D. WOOTTON, OF LONDON, ENGLAND.

CAMERA MORE PARTICULARLY FOR USE IN AERIAL PHOTOGRAPHY.

Application filed December 29, 1922.

'1 all whom "it may con-0cm 3e it known that I. HERBERT Dannow lVoo'r'roN, a subject oi the King of Great Britain, residing at lloyston, Stanley Road, South lVoodford. London, E. 18, England. have invented certain new and. useful lnr )rovements in or Relating to Cameras More fiarticularly for Use in Aerial Photography. of which the following is a specificaiion.

This invention relales to improvements in cameras more particularly for use in.

aerial photography or where it is desired to take a series of pictures in succession and has for its object a construction in which the plates to be exposed are successively brought into the focal plane of the camera. and removed therefrom.

A further feature of the invention consists in a construction of camera which may be employed in carying out surveys, in which the data required is automatically recorded by the camera, such information as barometer readings, altitude, inclination and other technical information being recorded simultaneously with the exposure of the plates.

According to the general principle 01 the invention, llle camera. is constructed for use with any given number of the kind wherein the plates which are mounted in pile formation in a change box or rotary carrier rotatably mounted Within the body ot' the camera and mechanism is provided for rotating said change box or rotary car-: rier so that each plate of the pile is succes- .--;i'.'ciy brought into the correct focal plane of the lens. for effecting the exg'iosure 0f the plates, for again rotating the carrier, for withdrawing each plate successively from the Front of the pile. and for replacing the same at he rear of the pile. so that the plates may be succeasively exposed until the whole of the plates have been dealt with. When. a change box is enmloyed, me hanism is pro,' ridrd whereby alter the change box has been placed in the body of the camera, the end rovers are smrcessively removed "from said change her; and after the plates have all been exposed, the said covers are again automatirally replaced so [hat the change box ready for removal from the camera. The driving mechanism for the carrier and the operating mechanism for the various parts of the apparatus may be operated My one or more electric motors geared to a tl \;'-wheel or its equivalent rotating about Serial No. 609,610.

a vertical or horizontal axis at the top or sides of the camera, and thus exerting a g'yrostatic action in steadying the camera. iilternatively, the fly-wheel may form part o'l the motor. The mechanism may be driven from the motor or motors through worm gearing, and it is preferable to interpose a clutch mechanism. which may be magnetically operated if desired, between the driving and driven gears, meansbeing provided for tie-clutching when desired. which de-clutch- Eng may be effected electrically.

The invention also includes other details or construction and arrangement of parts hereinafter more particularly described.

In order that the invention may be readily understood, reference. is made to the ac rompanying drawings, which show by way of example, a construction of camera according to the invention.

Fi ure 1 is an elevation of the camera, the casinglieing shown in section, and the front of the camera in which the lens is mounted is omitted.

Figure 2 is a transverse vertical section through Figure 1.

Figure 3 is a view in elevation with certain parts removed and with the outer casing and the rotary carrier shown in section.

Figures 4- and 5 are sectional elevation and sectional plan respectively showing the means for operating the focal plane shutter, and the arrangement of auxiliary and miniature lenses on the sliding carrier at the front of the camera. 7

Figures 6 and 7 are elevation and horizontal section respectively showing the mechanism by means of which the covers for the removable change box are retained aigainst the walls of the camera, the front plate of the mechanism being removed.

Figure 8 is a detail view of the mechanism operated by the movement of the change box within the camerafior operating the retaining means.

Figure 9 is a. transverse section taken on line 9- -9 of Figure 5.

Figure 10 is a view showing diagrammatically one method of supporting the camera.

Figure 11 shows a modified method of construction of the carrier or change box.

Figure 12 is a view to a larger scale of the driving mechanism'and clutch employed for moving the change hox within the camel-aim order to effect the removal or replacement of the covers for said change box.

Figure L3 is aside elevation a portion of thelreaiirzt c'a si 'ng' showiiitgJfiie ni 'cha nism for reversing the clutch illustrated in Figure 12. I V

Figure H is a simil'ar'vie'vv to Figure 13, showing the le 'er mechanism in another position.

Figure 14 is a side View of the sliding spring controlled member seen at the right of Figure 13.

Figure 15 shows the mechanism by means of'whieh the covers are secured to the ends of the ch'angebox.

Figure 16 is a detail View showing the mechanism through which the rotary carrier is given its intermittent rotation.

Figures 17 and l8 Show diagrammatically modified methods of supporting the camera.

Figures 18. 20. 2t and 22, are detached views showing the operation of the latches on the rotary carrier or change box and the slitl'ohle plunger at the renr of the camera ceasing.

Fig-tires 2-23 and 24 are front elevations of the iii-spares of one of the plate sheaths.

Figureffr is an end View of Figure 24.

l ig-rrres E26 and 27 are edge views of Figures 23 amt l igures 28 and 29 are views showingthe miter casing-oi the sheath and the springy fie. "h'le grippingrnember in said sheath to tricti ema-lly retain the plate therein and also to interlock 133 With slot in 131;

The appiiratus comprises a casing or lrame it) provided at its forii flrtl cnd with an spertnretl front wall 41 Within which the lens and any other parts may be nion ntecl.

The plates are each monnted in a sheath 42 ifnd the sheaths are mounted in pile tornration iis shown in Fight-e 2, in a change box t3 which is provided with removable end' covers or lids t-i see Figure 2 which are adapted to he removed and replaced by HHlUmttllCullV operating means hereinafter described. The change box 43 is placed into the body of the camera find is siuiportcd therein by a rotary tiarrir rind this rotary carrier is provided with trunnion beat; him; in the term of discs or the like 47 mounted in ball bearings 48 in dross slides 49' (one on each side) adapted to slide in the walls #0 of the frzinw or casting as shown in Figures 1-3 and 1?);

The. opposite walls of the plate carrier are provided with movable members 50. each of which is provided in the neighbourhtmd oi each endWrith e. lip or tlhnge 51 or its etniivalhnt. said lips or flanges 51 being zn'iaptrd at appropriate times. to project inn'ardiy through the Walls 45 of the carrier l5. but are normally retained in the ret acted position by blade'springs 52. (see Figure fii). At the rear ef the wall 45 of the plate carrier 45 at one end'ismmihted a rotary cam ineniller fii'l pivomlly supported on a pin or stud 54, the periphery of this cam 53 is adapted to beeregainst the outer face of the adjacent movabie member so that the said member may be moved inv ardly against the action of the blade spring 52 to project the lips or iisnges 5t thereon through the walls it! of the plate carrier 45 in order to engage the adjacent wall 45 of the change box 4? when the same is in position in the carrier 45. The cam 53 provided with a slot 55 in which is loouted a pin which is connected by means of a rod or the like 57 to the sliding member 50011 the opposite side of the carrier 45 so that when the cam 53 is operated, the mov able members 50 in the opposite walls are sinu'iltaneonsly projected inwardly to engage the change box 43 and retain same in position.

The end covers H of the chain-gr box 41 1 are provided with light tight slots or a ngnl ar recesses 59 (Figure 15) and on thrwalls @10 of the casing it) of the camera are pro vided spring operated turnhuttons (it), see Figures 2-15 or their eipiiva-ient adapted when the covers 4A on the: change be); 43 are brought into engagement therewith to be released and spring operated to retain the covers H fiat against the camera wall. This movement of the tnrnhnttons fit) is also adapted to effect the release of locking means for the end covers 44 of the change box l as hereinafter described. The tizrnbuttons (3H are each retained in position by a. lfll'klllg pin 51 (see Figure 6) mounted on a spring arm 62 which is adapted to he disengaged when the end cover is on tilic :ghsngc box it? is brought into close Contact with the wall oi' the camera easing or frame 40. The slots 59 in the covers 44 when brought into this position register with the turnlrnttons (ill which pass into the slots 33$). and owing to the locking pins 61 being released; the turnlnittons (it) are turned through an angle of 9% degrees. releasing the covers 44 from the change box eri and retaining: the covers 44 against the c-zinwia Walls. It is to be understood elm similar turnlnittons (it) are provided on the dianwtri rally opposite wall ot the casing so that when the change box 43 slidden in the opposite direction in the manner hereina t'tcr described. the some operation repeated with the cover 44 at the opposite end of the change box 43 the change box. if? being successively moved into close contact with the diametrically opposite walls of the (us-- ing or frame 40 by mechanism hereinafter described.

When the plates have been exposed. the sliding mceharfiisin tor the change box 4-3 is again brought into operation and the ends of the change box 48 are successively brought against the opposite walls of the casing or frame 40, the covers 44 are replaced and the change box 43 is again closed ready for removal and replacement.

The springs 64 and 64 controlling the movement of the turnbuttons (Figure 6) are arranged in two sets one of which 6l operates the turnbuttons 60 to rotate them in one direction, Whilst the other set 65 is brought'into operation to rotate the turn buttons 60 in the opposite direction to return the turnbuttons G0 to the normal position. This mechanism consists oi a pair of fulcrumed levers 66. The levers 66 are nor mally in the position shown in Figure 8 and when the change box i3 is slidden into position, on end of each of the l'ulci'umed levers 66 is depressed, the change box 43 engaging the same at the point 67 thereby tcnsioning the springs 64 which tend to rotate the turn buttons 60 from the position shown in Figure 6 to the dotted positions Figure 15. The turnbuttons 60 are however locked against rotation bv the spring operated locking pins 61 (Figure 6) which are only released by the abutment against them of the outer surface of the covers 44 on the change box 43, this taking place after the turnbuttons have entered their respective slots 59. The two sides of the casing of the camera are similarly constructed in so far as the mechanism for removing and retaining the change box covers 44 is concerned and the description of one will suffice to make it understood that the same operations take place on the opposite side of the casing 40 when the change box 43 is moved to the opposite side. As previously mentioned the spring 64 for op erating the turnbuttons 60 to the locked position are tensioned as the change box 43 is slidden into position. The'springs 64 are connected to one of a series of pivotal levers arranged in pairs, each lever T0 of each pair being connected to the corresponding lever T0 of the other pair by a connecting rod 68. The levers T0 of each pair are interoonncctcd pivotally at 69 so that when one lever is operated all the levers turn about their pivots to rotate the turuhuttons 60 connected thereto to a. uni Form ektent. The levers 70 of the lower pair (Figure 6) each have one end of the operating springfiaconnected thereto and the opposite end or the spring is connected to a sliding catch Tl (see Figure 8) which is in engagement with a book like portion 72 of the fulcrunied lever 66 which is operated by the sliding into position of the change box 43. henthe change box 43 is sliddcn into positiom these sliding catches 71 are pulled down to tension the springs 61 and connected thereto so that as soon-as the locking pins fil on the turnbuttons 60 are released. the latter are rotated by the tension'of the springs acting on the lever system 68,65). 70 (see Figure 6). Retaining pins 73 are provided on the change box covers 44 arranged in such positions as to limit the movement of the turnbuttons 60 in the locked position (Figure 15).

The change box covers -14 which overlap the box are provided, preferably on opposite sides with sliding bolts 74 which are adapted to be projected under the action of springs 75 into receptive slots in the edges of the change box covers 4-4 and these bolts each comprise a pair of parallel bars T t connected together at their inner ends by a cross member 54h the inner edge of which when said locking bars Tet are in the locked position lie closely adjacent the slots .39 for the reception of the turnbuttons 60. By this means, when the turnbuttons 6U are moved by their springs 64- to the locking position, the looking bars 74" are Withdrawn so as to release the covers 44 from the change box 43.

In order in provide additional security against the lllli covers 44 becoming" detached aiicr the change box 43 has bccn irilhdraivn l'roni the camera, each of the end covers 4-1 s provided with a rotary safety lock 76 adapted to be rotated by a key from ontside the change box 4;. The safety lock 76 when the change box 43 has been removed from the camera. is in the position shown in l 'ignro [5. in which it prevents the Withdrawal of the locking bars 74 from the change box 43. but when the change box 43 is being inserted into the camera. the safety lock To is rotated by a suitable key (see dotted line Figure 15) through the angle of El!) degrees so that the locking bars 74am Free to be withdriuvn by the rotation oflhe luruhuttons (i l as already described. The ?l];l!lg( box 43 is then slidden successively to the opposite sides of the camera casing and the lurnlnittiiins (ill are operated to remove he cover 44 and lbc change box 43 is then reiurncd to its normal central position ready for ope ation as hereinafter described. When the exposure of the plates has been completed, the operating mechanism for the change box 43 again comes into operation. During the movement of the change box 43 to one side from its central position. the front ends thereof make contact with a stop or projection 77 on the fulcruu'ied lever 66 which is now in the dotted position Figure 8 and imparts thereto a limited longitudinal movement against the action of the blade spring 78 which releases the sliding atch 7L and consequently the spring 64 which previously operated on the turnbuttons 60 to move them to the locking posilion ceases to be under tension. and the top springs 64 logethcr with springs 65 are now under tension and function to rotate the tornbuttons 60 in the reverse direction. so-

ihat when the end of the change 130x43 comes up against the cover 44 thereof which is being held flat against the wall 40' of the casing of the camera, the laurnhuttons are released and the springrs' l fi now iuo'vn the rnis T0 to their normal position, the cranked end bringing the turnhu-ttons to the unlocked position, the covers -14: being: simultaneously again locked to the eha'ngr b0 13 by the return movement of the turnhuttons G0 which release the looking bars 74. The same operation takes place in connecill)" with the opposite end of the ehang'e box 43, and when both covers have been reattached, the change box 43 is ready to he removed from the camera.

The lateral movement. or" the change her: 13 may he effected by hand or autoinatirally. in the former case, a: handle 79 is provided which may he mounted externallyo'f the'caS- ing as shown at 79 (Figure 13), or internally thereof, the handle being connected to-sli s ing liars H) on each side, which slide in a light. tight manner in the inner Walls 01' the casing.

\Vhen automatic means are l)l).'ltl8(l for moving the change hox ill, I provide a.

1 system of levers arranged in such a Way as to ensure the change hex 1 3 being moved 1n the correct alignment to prevent janlhing. The levers romprise a pair 0t depending arms 81 (Figures 1 and 3) mounted within the main frame and pivoted thereto at 82 and behind the sliding plunger, said arms be ing slotted at 83 10 enable the trunnion hcarings of the rotary plate carrier to pass therelhrough. The arms 81 are operated liy cords, cables or the like 84 (Figure 1) Winding and unwindingsuccessively on a pair of drums $4 or pulleys. the rotation of the drums or pulley 8i heinp; effected through intermittient gearing or by separate motor drive so that. the drums 84 are driven successively in opposite directions after a given time in terval, which interval is set according to the nnrnher of plates mounted in the carrier or change box 43 mounted therein.

The means for moving the change box 43 to earh side oi the camera for the purpose of removing the covers 4-1 are constructed as follows 1*- 81"), 85, are two motors. the shafts of which are provided with toothed piuions 30 which mesh with a toothed wheel 87 located crntrally ahove the camera. easing or preferably within the top of the casing. ()n the shaft o'lone oi the motors is a grooved pulley 89 around which passes an endless driving cord or the like 90 passing over guide pulleys 91. and around a grooved pulley 92 whi h is thus driven in a constant direction.

Mounted adjacent. the pulley 92 is a friction cone 93 slidably keyed to a shaft Ell mounted in suitable lmarings. The pulley 92 is provided With a conical friction surfaro 95 on its outer side and the doulile cone 93 is providedat each end with cooperating conical friction surfaces 96, these latter friction sorhtc being liiGalTQLlat such a distance apart that either may be brought into engagement with the rotating pulley 92413 moving the cone 9B axia l lty along its liste- Looscly mounted on: the shai t 0i eteaieh end of the double cone Share collars 9'7. Pivot ed to each of the rollers are links 9% (Figures 1 and 12) in tanrn pivoted to a: second link 99, the opposite end of which is pialotailiy connected to a-hrarlret 100, and tfhe hail-r998, 99 form a toggle mechanismnnmough whioli the axial inoveinentof the cone 93 is nifeetied. The toggles are operatedhy'levers 101 eai'ch connected at one end to an eeeentirie' pin 101 carried on a disc 102 and at its opposite end to the eonnertiing pin between the corresponding links 98 and 992 The discs 102, 102 are connertedfiogetiher by a eminent? ing rod or reds so that when said rod 103 is raised, the dies 102, 102 will each re tats in a clockwise direction; as seen in Eigure 1, to the some extent. By this means, as the shafts of the motors rotate in-an anticlockwise direction when. seen in plan, the friction pulley 92 will rotane in thedireetion: indicated by the arrow in Figure 1:, so that. if the discs 10? are moved in a. clockwise di rcction, the (one 93 Wis he moved dmvm wardly so that; the shaft 94 will lllfiifl l'il hiil direction indicated by the errovr in Figurezl, and it the discs 102 are rotated in the opposite directiomhhe (one 93 will be moved? up- \vardly and consequently the diueetion oi drive oi the shaft 9 1 will he. levense-du The friction cone elntclr isopeaated by the tollowin g mechan i am The slides 49 which carry the notary ea rrier are provided on: eaeh side with a projecting pin or the like 104 (Figures 13, 14% and 14). The adjacent Wall of the casing 40 is provided with a pivotal two-armed lever 105 the ends of which (to-operate with spring catches 106 and are engaged thereby when the lever 105 is rocked in either di reetion. The catches are each provided with a projection which extends intxr the path-of the pins 104 on the sliding mmnher 49, so that as the latter moves to each end in its path of movement, the catches 1 06* are op erated by the pins 1 0% in a manner hereinaiter descrihed. One end of the. lever 105 is resiliently connected by means of a pivotal rod 107 to the end of a transverse bar 108 passing through the discs- 102 so that when the lever 105 is rocked in opposite directions the clutch is operated to reverse the drive whilst when the lever 10!) is in the position shown in Figure 13, declut/ching'tahes piece, the double cone 93 being in the position shown in Fimlre 1. The cene clutch mechanism and t e Wall of the casing adjacent thereto may if desired be mounted closely adjacent the motors 85.

The drive to the grooved pulley 92 is constant. On the lever 105 being depressed,

the-cone93 is operated and the drive is transmitted to the she? 94, whereby one end 0% the cable or the like 8 1 will be wound on the drum 84 and one end wound oil, so that the sliding members all are moved towards one side of the casing. hen the change hex covers 44 are to be replaced, the lever 105 is rocked by the handle 105 to the position shown in Figure-141 and the sliding members 49 commence their movement to the right. When the sliding members 19 shown central in Figure 13 reach the end of their movement to the right (Figure 14" and Figure 13) the lever 105 is rocked to the position opposite to that shown in Figure 14 the catch 106 being first released by the pin 10 1 which then engagesthe cam surface on the lower side of the end of the lever 105, so that the end of the lever 105 to the left in Figure 14 is now retained by the catch 106 and the clutch cone 93 is reversed, reversing the drive to the drums 84 and thus moving the sliding members 49 in the reverse direction towards the opposite wall of the casing, that is to the left of Figure 14-. On the sliding members reaching the end of their movement in'this direction, the lever 1051s again reversed to the position shown in Figure 14}, and the clutch cone 93 is also reversed, As the sliding members 19 approach the position shown in Figure 13 (moving from the extreme left towards thecentre) they engage a sliding member 106 and imparts a longitudinal movement thereto releasing catch. 106 on'the right and the spring catch 110 moves into engagement with the sliding member49, when it reaches its normal position the handle 105* and the lever i105 returning to the normal position Figure 13, the bolts 301 on 195 (Figure- 1) and partly shown in Figure 3 also return home under their own springs.

The drum 841 is driven from the shaft 94 by means of a worm 111 engaging a Worm wheel '112 keyed to the drum shaft 84 (Figures land 12).

During the movement of the sliding members -19 which form bearings for the rotary carrier, from side to side of the casing as just described, the end covers 44 on the change box 13 are brought successively into position against the side walls of the casing 401:0 be removed or the end covers 14 are re placed as previously described.

The plate carrier 15 comprises a substantially rectangular box like casing open at each end and shaped to receive the change box 13 previously described. The bearing discs 17 are provided with stub axles 47* on which are loosely mounted spirally toothed wheels or cams 113 arranged in pairs, one of each pair being located on each side externally of the casing or frame 40.

The inner pair of spirally toothed wheels 113 are adapted to engage pinions 1114 connected toa sliding member 115 mounted-to slide in guides in the frame 410 towardsthe front of the camera, whilst the outer pair of spirally toothed wheels 1116 engage pinions 117 carried by a sliding plunger 118 mountedin similar guides towards the rear of the camera casing,or1vice versa.

The periphery of each ot-the spirally toothed wheels 113 is formed substantially concentric to the axis of rotation over ap-;

proximately half its circumference so that during the period that the corresponding pinions which mesh with said wheels are in engagement with this concentric portion, no sliding movement is transmitted to the sliding member at the front of the camera or to the lunger at the rear of the camera respective y, thus allowing the plate carrier to rotate.

The outer ends of the stub axles 47 oi the carrier are provided with similar operating mechanism for imparting intermittent rotation to the carrier, and the mechanism now about to be described with reference to one side, is to be understood as being duplicated on the opposite side.

The stub axles 47 have rigidly secured thereto a disc or plate 120 having a rin 121 provided with recesses 122 (Figure 16% located at diametrically opposite points.

The spirally toothed wheel 116 carries 'a pivotal pawl 123 mounted on a pin 125 Figure 16) and as the wheel 116 rotates il igure 16) it carries the pawl 123 with it and consequently the carrier when the pawl 123 is in engagement with the forward end of either of the recesses 122, and means are provided whereby at the end of each revolution of the spirally toothed wheel the pawl 123 is disengaged from the end of the recesses and the spirally toothed wheels and the pawls 123 move round without the carrier during the first half of the next revolution, when the pawls 123 re-engage with the opposite recess 122 at the commencement of the second half of the latter revolution and move the carrier round with it.

In order to absorb shocks when the pawl 123 comes into contact with the slots or recesses 122, acatch 124 is provided consisting of a block connected at its front end by a suitable spiral spring 126 to a pin or stud 126* fixed to the spirally toothed wheel 116, said spring 126 being housed in an annular channel 127. The rear end of the bloclr 124 is provided with resilient spring forks 128, the ends of which form catches which engage in recesses in the sides of the pawl 123. The block 124 is pressed into engagement with the outer surface of the ring portion 121 of the disc by blade springs 129 so that when said catch block comes opposite to one of the recesses 122, it is pressed into engagementwith said recess 1.22 and is retained, the pin or stud 126 con- 124. \Vhe'n the pawl 123 eiitersithe catch.

the carrier is rotated positively with the spirally toothed wheel in the sarhe direction. As so'Unas the tail of the pawl 123 reaches the position indicated in Figure 1 the tail comesinto co'ntaet wit'ha stop 130 which is adjustably mounted on the casing, the-pawl 123 is rocked about its pivot and the catch block 124 is withdrawn from the recess 12% with which it was previt'jusly in engagemeht,

the rotation of the carrier thus being brought torest and the foiked ends of the catch block 12 1 opened out to release the same from the pawl 1:23 by a stationary ellipti cally shaped cam 131 and the catch 125 is carried forward in advance of the pawl 123 b the spring 126 until "it reaches such a posi ion as to engage with the other re'cess 122! At the same time the pawl 123 returned to its normal position by its spring'1'25 (Figure 16) after its tail has ptls'sed the stop 130 and re-efigages with the catch block 124 on completing a fittther halt *revolntionof the spirally toothed,

wheel 1T3; 'a'nd the same operation takes placeavhen the pawl 123 again reaches the position just described: By this meahs', it will be seen "that during each rotation of the niemher .earrying'the 'pawl123 the rotary carrier is carried round through half a revolutihn during'the first half of the revelut-ion and remaihs stationary during the secbnd half of the revolution, or Vice ersa': During these stoppages the plate sheaths 4-2 are either removed from the front tit the pile or plated at the bak of the pile, these operations taking plate successively as now about to be described. As previously mentioned the meha'nism just described is repated on the opposite side of the casing if desired and the operations on 'each side take place synchronously.

The plate shehths 42. which are shown separately in Figures 23 to 29.'are formed in twh parts from sheetmetal. indi afed'at 131. and 132 respectively; Each of the parts is provided with a chhnrielled edgealohl thrce sides, andthese channelled ed ges are adapted tohou'se a blade sprinrhlfrl of"subs'tant al'l t Ll' shtips which is fixed. within the part 132 as shown in Figiurefl its ends projecting so as to slide within the open ends 134 t the channelled edges ofthe part 131. will he i'ea dil'j; seen from the drawings the spring meinher 1331s pk'm i'de'd with curved ortiehs at 133 in order to resiliently press within the holder by a pair of pivotal latches located on opposite sides and at'both ends of the carrier. The pair of latches 140at the ffont end off the carrier (Figures 2-19 22) are formed inthe manner of pawls each being carried by a pair of arms 1&1 and having at the forward inner end transverse lip of projection which takes over the edge '0 the front plate sheath. Located between the arms of each latch and slightly inwardly of the lip thereon is a second latch 142 which; when the plates are in position, engages behind the edge of the ohter'most plate sheath as hereinafter more "fully de scribed; The inner face of the outer latch 142 on each side is formed with a curved cam like surface 143 and means are provided whereby the sliding plunger 1'18 isbroflght up to the front end of thecarrier ('Figure'2) toopen the outer latches 140 so as to en= able the outermost plate sheath to begrilpped and withdrawn from the plate carrier at the appropriate time. 7

The plunger 118 carries a frame member the opposite side edges of Which are pro v dod with two spring pressed latches 144 F 1-,21116 2, said latches cooperating with one another ina manner hereinafter described. These latches are adapted at apprbpiriate times to pass into the end o'f'the rotary plate carrier to press, (when the plunger 118 moves up to the front end of the carrier, which has received halfof a revolution), the outer spring? latches 140 thereon outwardly, and to grip the edge of the outermost plate sheath -12, so that when the plunger is Withdrawn, the plate sheath &2 is Withdrawn with it. Theplunger 118 is piov ided with an inner pan of latches 145 which act asletaining pawls 'for the plate shea'th.

The Opposite opeh end of the rotaryean rie'r is provided with a pair of spring controlled latches 146 as previously described. Theselatches 1456 are alsoea'ch mounted'at the endso'f a pair of arms 14?, an'd'the outer faces of these latches 146 are curved inv wardlt' towards their free ends at 148; so

that when the spring plungeir 118 carrying the plate sheath 42 previously rmov'ed from the opposite 'opeh end of the carrier (that is the f'f'ont) comes into contact therewith; said outer latches 144 on the plunger 118 are pressed outwardly (Figure 20.) to release theirgrip on the plate sheath 42, the plunger 118 moving forwardly to such an extent as to press the plate sheath 42into the open rear end of the carrier, and when the plunger 118 is again withdrawn the outer spring latches 146 on the carrier engage the edges of the plate sheath 42 to retain the same in position, the film side of the plate being outermost.

As previously described. the plate sheath at the front of the pile. that is the sheath carrying the plate about to be exposed, is gripped on its front opposite edges by the outer spring latches 140 on the carrier and is supported at the rear by the inner spring latches, those inner latches also serving the purpose of retaining the remaining plate sheaths 42 in position in the carrier as shown in Figure 19. It is obvious therefore, that when the plate as just exposed has been withdrawn, it is necessary to advance the whole pile of plates forwardly in the carrier the distance of one sheath. This is efiected in the following manner. At the rear of or behind the inner spring latches 142 on the front end of the carrier or change box 43 are members 145 having a sliding movement in the walls of the carrier, and the inner ends of these members have elongated tongues having at their ends cam surfaces 152 which engage inclined surfaces on the pivoted ends of the inner latches 143 at the front end of the carrier. By this means, when the spring controlled plunger 118 approaches the rear end of the carrier, the re training spring latches 145 on the plunger 118 engage the ends of the slidable member 142 on the plate carrier and in moving the last mentioned members inwardly, the cam surfaces 152 thereon engage the inner latches at the front of the carrier and move the free ends thereof outwardly (Figure 20) thereby permitting the foremost plate sheath 42 to move forward to engage the outer latches Mil at the corresponding end of the carrier. these latches 140 being locked against outward movement by overlapping flanges 297 on the slidable member 115 (Figure 2), the forward movement of the plunger 118 moving the plate sheath 42 carried thereby into the rear end of the carrier and assisting this forward movement of the pile of plate sheaths 42.

As previously described. the motors are adapted to drive a centrally disposed toothed wheel 87 in a constant direction. This toothed wheel drives through a toothed wheel (not shown) pinions 160 mounted at the upper ends of the shafts 161, the lower ends of which have keyed thereto worms 162 which engage a worm wheel 163 mounted on a shaft 164-. The shaft 164 carries a toothed pinion 165 which engages a large toothed wheel 16'? which is mounted on the trunnion disc bearing 47 of the rotary carrier and is fixed to and rotates with the spirally toothed wheel 116. This driving mechanism is duplicated on' the opposite side of the camera casingso that the carrier is driven at appropriate times from opposite sides synchronously.

liar-h of the toothed Wheels 167 has fixed thereto a disc 168 the outer periphery of which forms a cam surface 168 which operates upon a pivotal spring controlled lever 1G9 carrying a roller 170. The lever 169 is adapted to operate a locking pin 171 in the wall of the camera casing said pin being carried. by a blade spring 172 or spring operated arm so that when the carrierreaches the end of its half rotation hereinbefore described. the locking pin 171 is moved through the Wall of the casing to pass into a recess in the carrier and lock the same against movement, said locking pin 1'51, being again released by the cam surface 168" immediately prior to the commencement of the further rotary movement of the carrier. This locking mechanism is also duplicated on the opposite side of the camera casing to engage the opposite wall of the rotary carrier.

in order to bring the operating mechanism for the movement of the chaugeboi 43 into operation at the proper time, that is when the whole of the plates for which the change box 43 is constructed, have been exposed, counting mechanism is provided through which said operating mechanism for the lateral movement of the change box 43 is operated. I K 1 This is effected by providing an under flange or shoulders of one of the spirally toothed wheels with a pin (ii-projection 180 see Figure 1, which once during its revolution strikes a tooth of a star wheel 181 which in turn engages through a pin 182 thereon a toothed bevel wheel 183 having fixed thereon a ring 184 provided with a peripheral cut away sector. Bearing against the ring, is a spring pressed axially movable rod 185 having a pin attached'thenito and acting in a similar manner to the locking pin 171. and when the bevel wheel a nd ring have been rotated through a predetermined distance dependent upon the number of plates to be exposed, the rod is released the end. thereof engages the recess in the ring and locks the rotary ozrrier in the position ready for the previously described movements of the change box Theinoviuuent of the rod also serves as a contact maker and breaker, breaking the main current and switching on a current through magnets 19',v which draw down the ring 1972 (this ring has freely mounted upon it one or more toothed wheels) thus throwing out of gear the intermediate toothed wheels between the toothed uheel andl'he shafts 16. On raising the axially movable rod l85 the current through the magnets is brolreu and the gear wheels again whi h are mounted freely upon the ring enter in o mesh with the toothed wheel HT by memes-of spring pressure upwards (not shown). 7 r 7 JAN] illhe bevel wheel 1S3 meshes with a. bevel wheel 19-1 mounted on the lower end of a shaft 195. the upper end of which carries :1 here} wheel 196 engaging: at similar wheel 19? to which is fined u toothed wheel E98 meshing with u. counting; wheel 399. this letter wheel lining provided with marhin s corresponding to the number oi plates i'or which the change lJOX 43 is designed and having a handle 200 by nicunsot which the same many he set; when the chains? b t-2; -12 is inserted, or by which the disc 183 may be rotated to bring the magnetic clutch into operation when the required number of plates hare been ex posed.

21) is manually operate-d pivotal lever mounted on a stud $511. This lever is incanded in such a. position that when thechangn box 4-3 reaches a position in which its ends face the wall of the casin against which the covets are retained. it euehh s the panel 123 to be disengeged togcther with the catch 124 from the ring 121. so that the sliding; member 49 Partying the change box 43% is able to more from side to side within the miners casing. This is oorrssar-y us in the lateral movement of the change box. the large toothed Wheel 16? is partially rotated and this rotation in an anticlockwise direction would not. be possible it the nuwl 123 and the catch 12% were not disengaged 10111 the ring 121 of the disc 12%). In this connection the pawl is brought to a position shown in Figure 16 when the ends oi the change box 43 are in position to more laterally. so that the depression of the lever 210 to the position shown in full lines (Figure 16) enables the sliding members 49 and the change box 43 together with the spirally toothed wheels 113 to move laterally with respect to the casing. In so moving the pawl 123 is reel-red by the engagement of the tail thereof with the end of the lever 210 and in so rocking the pawl 123 caught and retained by a pivotal Catt-h .212 coir trolled by 21' blade spring 213 which takes place when the change box "13 mores to the right (Figures 1 and 16). During-the move ment of the change box 43 from right to left, the head of the catch 212 passes over the nose of the depressed lever but strikes the shoulder of the said lover at 210* which allows the pawl 123 to he retained by the Patch 212 until the sliding member 49 passes its central position, and is depressed thus freeing the tail of the pawl 123 from the catch 212. When the change box 13 again moves from its maximum position on the left to its central position. (Figure 1) the pawl 123 and the catch 124 which is still. connected thereto recngage with the recess 122 of the ring 121 ready to impart rotation thereto.

The lever 210 (see Figures 1 and 16) is operated by a hand lover or the like 210 which is pivoted on a bracket. lltltlmmd is also adapted" to withdraw a locking holt 301 which normally engages the sliding member 4'9 and seoures tihesemi againstniovement.

The sliding member 115 (Figure at the tiront end of the camera is operated during its outward mo -cutout. that is away from the change box 13, by the spirally toothed wheels 113, and its inward more meat is effected by means of springs 221). The springs 220 are preferably four in nunr her and are located at the four corners of the frame 10. and are each attached at one end to the sliding member 115 and at the rear 5111110 the frame 221. sec liigurc 1, or the springs 220 may be connected to the sliding plungers 118.

A flllll'lGlfelIfiPOI'tfiflt denture of the present invention consistsin an arrangement where by each photographic plate exposed is adapted to record technical and other informatiomsuch for instance as time, date, altitude. number. inclination and the like, thindetu heing photographed from technical and other lHSlilllDlBlllB attached to the out,- side ofthe camera. This may be efiected by directly photographing the instruments or parts thereof or by refimt'ron. The data. is nhctogra ahml hr prmfiding a number of smell auxiliary lenses 230 (Figure 5) ettacheil on either side of the frame of the camera. These lcnsesare mounted so that when the sliding member 115 moves into contact with the front of the change box i passages Q31 in the sliding member 115 hevinggrefiectorsQSQ register with the auxiliery lenses 2% so that when the shutter is operated. the desired record is photographicelly mcoerded on the plate (Figure 2).

Further it is proposed to employ a series of miniature lenses 240 more, or less arranged in sets, the lenses being either of different loci and located at uniform distenors from the surface of a mask carried by the sliding member 115 Figure l) or eltaernzitively the lenses are of uniform tool and one mounted at different distances from the surface of the mask. The miniature lenses 240 are curried on the sliding 115 e17 the forward end of the camera on which the shutter is mounted. The lenses Q10 are arranged to giro focus only of its corresponding held on the main photegreph, endthe date produced by the lenses or sets of lenses 240 on the plates are photographed preferably along two sides (see Figures Q43 3), such for instance as the top and bottom. By this means the lenses 2 53 operate as what man be termed range finders. For example, ione lens is a set as constructed to give a sharp focus at szryflfit) feet, from the camera and the other lenses in the set to give a sharp focus at gradually increasing distances and the anereid barometer gives a reading or 1030 feet when aphotograph is taken over hilly country, it follows that if a sharp photo-- graph image is iven by the lens having the 250 feet range t at that corresponding portion of the ground photographed in the main photograph will be in the neighbourhood of 750 feet high.

It is to be understood that the mask 241 containing the miniature lenses ma y be removable from the sliding member when the apparatus is not required for surveying work, but is however intended at all times to employ the larger auxiliary lenses for recording the readings of aeronautical and other instruments either within their own masks embodied in the main mask or without their niasks giving their images in conjunction with the main photograph. Thus the compass reading or needle pointer may be photographed directly on to the photograph at the same time as the main photograph is taken. Preferably one focal plane shutter 242 is employed to photograph all the recorded data.

The movement of the sliding member 115 towards the front of the camera in which the main lens is mounted is adapted to wind 243 and roller 244 is mounted on an axially movable shaft 245 controlled by a spring 246 which normally tends to urge the shaft to the right in Figure 5. The right hand end of the shaft carries a toothed pinion 247 which meshes with an inclined toothed rack 248 (Fi ures 2, 4 and 5) so that as the sliding member 115 moves forwardly not only is the roller 244 rotated to Wind the blind thereon, but the shaft 245 is moved axially to the left until an annular groove 249 in the shaft register with a spring catch 250. (Figure 4.) The shaft also carries a ratchet member 251, which when the shaft 245 has been moved axially to engage the catch 250 with the groove 249 dotted lines Figures 4 and 5), engages a co-operating pawl locking the ratchet against unwinding (not shown) on the bracket carrying the roller 244. By this means when the sliding member 115 has reached the end of its outward movement. the shutter will be wound, ready for operation. On the return movement of the sliding member 115, the pawl of the ratchet 251- is caught by a pin on the front of the change box 43, the roller 244 is thus free to rotate under the action of the spring in the roller 243 thus effecting the exposure. The shutter is provided with a projection which after the exposure has been made engages and releases the catch 250 so that the shaft 245 moves to the right under the action of its springs 246.

a The sliding member 115 is also provided with aninclin'ed rack (not shown) which meshes with a toothed pinion on one endof the roller 260 of the salet shutter 261 (see Figure 4). The other roller or shaft 260 carries a ratchet wheel 262 with which cooperates a pawl 263 mounted on one end of a lever 264. the opposite end 265 of which is located in the path of the end of the shaft 254. In moving towards the front wall of the camera, the rack on the sliding member engages the toothed pinion on the shaft 245 winding it exactly in'the same manner already described with reference to the main shutter, and the rotation of the shaft 245, winds a spring until by the time the'slidin'g'member reaches the "end of its forward travel, the shaft 245' has been moved axially within its roller, and the shutter material 261 is retained by the pawl 263 co-operating with the ratchetthereon. The shaft is also retained in its axially moved position by the member 266 which engages a groove on the shaft 245. The opposite end of the pivoted member 266 carries a pin 270 located in an opening 267 in the casing which is registered with the end of the axially movable shaft 245 of the main shut ter. By this means, when the slidin" memher 115 moves towards the change 0x 43, the projecting end of the shaft 245 engages the end 265 of the member 264 and releases the pawl from the ratchet wheel mounted on the roller 260 on shaft 260 thereby permitting'the teusioned safety shutter 261 to open as the sliding member reaches the change box 43. When the sliding member reaches the change box 43 the catch co-operating with the ratchet 251 is released the main. shutter operates under the action of the spring in the roller 243 (see Figure 2). After the shutter 242 (Figure 2) has again closed, the projection on the blind of the shutter operates the catch 250 releasing the shaft 245 which now moves axially to the right, the'right hand end of the shaft 245 be ing projected-against the pin 270 (on one end of the member 266 and passing through in the wall of the casing) which in turn. isengages the member 266 from the grooved shaft 260 so that the latter may move axiaily'to its normal position under the action of its compression spring, the ratchet 251 being at the same time released from its pawl, the roller is operated by the tensioned spring in the other roller the one on shaft 260 having being released.

The pivotal and sliding catches on the change box or rotary carrier are normally retained in engagement with the sheaths by means of blade springs, which however for the sake of clearness are not shown inthe drawings, I may however provide the arrangement shown in Figure 11 for controlling the catehes this veiw shows one of. the open ends of the changp box 43,; and the latches are located on t e top and bottom i box. and means wells 28%230, The oqter edges of the latches are provided with proiections 281 which are connected tosprings 282 located within the walls 283, 283, respectix 'nly oi the vchange box the inner ends of the springs being connected to an adjustable member 284: serving to enable the spring tension to be, adpisted.

he camera may be supported in the aerial machine or vessel topvhich it isfitted inatically in igqre '17 the eamera rests upon air cushions or t e like 99* the front portion of the camera projecting through an the floor or the like 29L of the aperture in aerial machine and being held imposition connected to the by stays 294 preferably camera and or to .tln floor by means of springs (HOt ShUWIL) 1n the construction shown in Figure 1&5, the -nnera is supporte onpivotsin a frame or 1 or 29?, the method of support being such that the oamera u ny he tilted orinelined bodily by ad usting the. retaining screws .296, oneof Wiioh is sho wn inthe figure, theoppositescrew being located on the opposite side.

It will be iunlerstood that although I have deseribed in detail the oonstruotion of the various minor parts of the apparatus that such parts, may be replaced by others best suited for the purpose Witl outdoparling from the principle of invention. The driving means in; the various parts maybe replace: by any other suitable transmission mechan sm suoh worm drive, rarer and pinion gearing and the like What I do claim as my, inyention, and de sire to segguro by Letters Patent, is

An aelial or like camera comprising a rotary plate carrier, a removable and r2- plaeeable change-box associated with said carrier, a cover at each end of said changelor automatically removing and repluoing saidoorers Within the camera.

2. An aerial camera comprising a rotary mrrier, a nhangebox, a movablomember aselated with said barrier, yioldable means for normally,maintainingsaid member in its I't'tiQZLCtQll position, a cam adapted to bear adiurrnt said member fol-engaging the latter with said change-hon. sheaths in said carrier. plates mounted in said sheaths, spring:

j controlled catches Supporting said sheaths,

and means w tch-e5.

3V. in aerial qamera comprising a rotary earriex. a changebox a movable member associated with said carrier, yieldable successwely operating said In the oonstrnetion illustrated diagram means i'or normally maintaining saidmem her in its retraeted position, a cam adapted to bear against said member for engaging the latter with said change-box, sheaths in sairloarrier, plates mounted in said sheaths and means through half a revolution to permit the 'loremost plate sheath being withdrawn, and through a further halfg'erolution to permit the insertion of the said plate at the rear.

4 An aerial. camera comprising a rotary carrier, a change-box, plate earryiiig sl'ieaths. a slidable plunger adapted to engage the plate sheaths to withdraw them successively from the :front and means for subsequently operating the plunger to release said plate sheaths for insertion atthe rear.

5. An aerial camera comprising a oa s;- ing, a rotary plate ,carrier, a removable an i replacuible change-box, covers at the ends of said change-bum means forinoving said rarrier laterally vithin the camera casing and means tor releasing said covers from said ohangvrbox and retaining them.

6. An aerial camera comprising a casing; a rotary plate earrier, a removable and re pi-iceable mango-box, end novel's associated with said change-box, slots in said covers and means on the casing for cooperating; with said slot toseonre said covers.

7. aerial camera comprising a casing, a rotary carrier; 3, change-box, plate carry ingsheaths, a slidable plunger grip, toothed spiral Wheels for operating said slidable plunger grip in one directionand sprin 's foroperating said grip in the opposite ireotlon.

8. An aerial cameracomprisinga easing, a rotary plate carrier, a siding member, means mounted coaxially with the axis of rotation of the uarr'er for operating the member in one direction and means For returning said member.

9. An aerial camera comprising a casing, a rotary plate carrier, aremovul'ile change box, means for imparling intermittent rotution to said carrier, means for Withdrawing earh plate successively from the front and replacingfsaid plate to the rear, means for effecting the exposure of each "plate, a sliding member in lheibottom of said Gas lug, said Sliding member having reflectors thereon, :1 series of lenses adapted to regis for with said rellrrtors when the sliding member is moved in a u'edetermined posr lion for photographiea ly reco ding aeronautical data simultaneously withthe exposure of each of the plates, 7

10. A ae -ial cameracomprising a casing, a plate carrier, of'the carrier, focal. lane shutter on said member. means for Winding said shutter during the movement of the sliding member towards the front of the eamerafahd for operating said corner means for operating said shutter when the sliding member is brought into engagement with the carrier.

11. An aerial camera, comprising a cas- 5 ing, a rotary carrier within said casing, a removable change box, plates mounted in said carrier, means for imparting intermittent rotation to said carrier, means for withdrawing each plate successively from the front and for replacing said plate at the rear, means for effecting the exposure of each plate located in the correct focal plane, and a safety shutter adapted to be operated by the movement of the sliding member at the front of the camera.

H. D. WOOTTON. 

